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<?php
/**
* @copyright Copyright (c) 2017 Matthias Held <matthias.held@uni-konstanz.de>
* @author Matthias Held <matthias.held@uni-konstanz.de>
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
namespace OCA\RansomwareDetection;
use OCA\RansomwareDetection\Analyzer\FileExtensionResult;
use OCA\RansomwareDetection\Analyzer\EntropyResult;
use OCA\RansomwareDetection\Db\FileOperationMapper;
use OCA\RansomwareDetection\Service\FileOperationService;
use OCP\ILogger;
class Classifier
{
/**
* File suspicion levels.
*
* @var int
*/
const SUSPICIOUS = 3;
const MAYBE_SUSPICIOUS = 2;
const NOT_SUSPICIOUS = 1;
const NO_INFORMATION = 0;
/** @var ILogger */
private $logger;
/** @var FileOperationMapper */
private $mapper;
/** @var FileOperationService */
private $service;
/**
* @param ILogger $logger
* @param FileOperationMapper $mapper
* @param FileOperationService $service
*/
public function __construct(
ILogger $logger,
FileOperationMapper $mapper,
FileOperationService $service
) {
$this->logger = $logger;
$this->mapper = $mapper;
$this->service = $service;
}
/**
* Classifies a file.
*
* @param Entity $file
*
* @return Entity Classified file.
*/
public function classifyFile($file)
{
$file->setSuspicionClass(self::NO_INFORMATION);
if ($file->getCommand() === Monitor::WRITE ||
$file->getCommand() === Monitor::RENAME ||
$file->getCommand() === Monitor::DELETE ||
$file->getCommand() === Monitor::CREATE
) {
if ($file->getFileClass() === EntropyResult::ENCRYPTED) {
if ($file->getFileExtensionClass() === FileExtensionResult::SUSPICIOUS) {
$file->setSuspicionClass(self::SUSPICIOUS);
} else {
$file->setSuspicionClass(self::MAYBE_SUSPICIOUS);
}
} elseif ($file->getFileClass() === EntropyResult::COMPRESSED) {
if ($file->getFileExtensionClass() === FileExtensionResult::SUSPICIOUS) {
$file->setSuspicionClass(self::MAYBE_SUSPICIOUS);
} else {
$file->setSuspicionClass(self::NOT_SUSPICIOUS);
}
} else {
$file->setSuspicionClass(self::NOT_SUSPICIOUS);
}
}
return $file;
}
}
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